Immuring

(Latin). Burying in a wall. The Vestal virgins among the
Romans, and the nuns among the Roman Catholics, who broke their vows of
chastity, were buried in a niche sufficiently large to contain their
body
with a small pittance of bread and water. The sentence of immuring
was Vade in pace, or more correctly, Vade in pacem (Go into peace —i.e. eternal rest). Some years ago a skeleton,
believed to be the remains of an immured nun, was discovered in the
walls of Coldingham Abbey.

The immuring of Constance, a nun who had broken her vows, forms a
leading incident in Scott's poem of Marmion.